Explanation
An automation that imports subscriber data regularly and updates key data extensions is what NTO should create as a good first step to add automation to its email marketing. This automation will help NTO keep its subscriber data up-to-date and consistent across different data extensions. It will also enable NTO to use this data for segmentation, personalization, reporting, etc. An automation that deletes old data extensions, emails, and reports may be useful for cleaning up unused assets, but it is not directly related to email marketing. An automation that contains several recurring emails and decisioning points may be too complex for a first step and may require more planning and testing.

Collecting emails at offline activities, such as in-store events or other physical locations, is a best practice for increasing subscribers. It ensures that the emails collected are from individuals who are genuinely interested in the brand and are more likely to engage with email communications. This method also helps to maintain the quality and relevance of the email list.
References: Salesforce Marketing Cloud Documentation on Subscriber Acquisition Best Practices